Sadly, I still can’t visit your website. I performed a site search, and here’s a screenshot of what I saw. Below a few search results is the message below that might be the reason the site is on a blacklist:
In response to a complaint that we received under the?US Digital Millennium Copyright Act, we have removed 1 result(s) from this page. If you wish, you may?read the DMCA complaint?that caused the removal(s) at?LumenDatabase.org.
Regarding the post sitemap throwing a 500 error, often, we see problems occur in combination with another plugin or theme. The fastest way to rule out any conflict is to deactivate all non-Yoast plugins and switch to a standard theme like Twenty Twenty-Two.
Please test this on your development or staging site if you have one. If not, we recommend using the Health Check & Troubleshooting plugin. This plugin has a troubleshooting mode, which does not affect normal visitors to your site.
If you’re unfamiliar with checking for conflicts, we’d like to point you to a step-by-step guide that will walk you through the process: How to check for plugin conflicts
If you feel uncomfortable doing this yourself or if this does not solve your issue, our Yoast SEO Premium plugin comes with one year of (technical) support.